K&N for '08 GTS
 

after waiting for a K&N to finally come out (i live in vt...we are slow) for the '08 GTS I was able to order it and slap it into my car...I'm blown away by this simple $55 mod....now my GTS has a deep throaty sound when the mivec hits around 3250rpm. It's got a little more kick to it when the mivec kicks in but still lacks the low end torque....if you have been living under a rock such as myself and haven't made any mods yet, this is a really cheap and fun addition to your GTS!!!!!!

I've got an Injen CAI for my 09 GTS. It has a sweet sound once the mivec kicks in indeed. Also getting about +3 mpg.

Intake is one of the best things you can do to your car, and usually the cheapest.